Switching assembly for electric tool and electric tool

Abstract

The utility model relates to an adapter assembly for an electric tool and the electric tool. The switching assembly for the electric tool comprises a shell, a first transmission shaft, a reverse transmission assembly and an output shaft, one end of the first transmission shaft is located in the shell, and the other end of the first transmission shaft is used for being connected with the electric tool; the reverse transmission assembly is contained in the shell and is in transmission connection with the first transmission shaft. One end of the output shaft is in transmission connection with the reverse transmission assembly, and the other end is sleeved with a to-be-released working head; the output shaft rotates under the transmission effect of the reverse transmission assembly, and the rotation direction of the output shaft is opposite to the rotation direction of the first transmission shaft. The switching assembly can drive the working head to be released to rotate reversely, so that the working head clamped in the wall body is released, the releasing efficiency of the working head can be improved, and damage to the wall body can be greatly reduced.

Description

Technical Field

[0001] This application relates to the field of power tool technology, and in particular to an adapter for power tools and power tools. Background Technology

[0002] Rotary impact power tools (such as electric hammers and impact drills) are prone to jamming when the drill bit encounters hard materials such as steel bars inside the building during operation.

[0003] Operators typically use manual methods such as shaking or hammering to free a stuck drill bit. However, manually freeing a stuck drill bit not only reduces work efficiency but also risks damaging the wall. Utility Model Content

[0004] In view of the above, this application provides an adapter assembly for power tools and a power tool to solve at least one problem existing in the prior art.

[0005] In a first aspect, embodiments of this application provide an adapter assembly for power tools, the adapter assembly comprising:

[0006] case;

[0007] A first drive shaft is rotatably supported on the housing, with one end of the first drive shaft located inside the housing and the other end used to connect to the power tool;

[0008] An output shaft is rotatably connected to the housing. One end of the output shaft is connected to the reverse transmission assembly, and the other end is provided with an axial hole for receiving the work head to be freed.

[0009] An impact transmission assembly is housed within the housing and is drively connected between the first transmission shaft and the output shaft;

[0010] The impact transmission assembly receives power from the electric tool and stores energy in the circumferential direction before impacting the output shaft, thereby causing the work head to be freed to be subjected to a circumferential impact torque and thus free itself from the predicament.

[0011] In conjunction with the first aspect of this application, in an optional embodiment, the circumferential impact direction applied by the impact transmission assembly to the work head to be freed is opposite to the direction in which the work head to be freed is stuck, and the reverse transmission assembly includes:

[0012] Second drive shaft;

[0013] A reversing component is connected to the second drive shaft, which rotates under the action of the reversing component so that the rotation direction of the second drive shaft is opposite to that of the first drive shaft.

[0014] In conjunction with a first aspect of this application, in an alternative embodiment, the inversion component includes:

[0015] A forward-rotating gear is connected to the first drive shaft, and the forward-rotating gear follows the first drive shaft to rotate in a first direction;

[0016] A reverse gear is connected to the second drive shaft. The reverse gear meshes with the forward gear and rotates in a second direction, which is opposite to the second direction.

[0017] In conjunction with the first aspect of this application, in an optional embodiment, the adapter component further includes:

[0018] The speed reduction mechanism is connected to the second drive shaft.

[0019] In conjunction with the first aspect of this application, in an optional embodiment, the adapter further includes an impact transmission assembly, the impact transmission assembly comprising:

[0020] The third drive shaft is connected to the reduction mechanism.

[0021] An impact assembly, connected to the third drive shaft, is used to apply a circumferential impact torque to the output shaft under the transmission action of the first drive shaft.

[0022] In conjunction with the first aspect of this application, in an alternative embodiment, the output shaft has an anvil (41) at the end near the anvil hammer; the impact assembly includes:

[0023] An anvil hammer is fitted onto the third drive shaft and engages with the output shaft;

[0024] An elastic element is fitted onto the third drive shaft, with one end of the elastic element connected to the anvil and the other end connected to the third drive shaft;

[0025] The fitting is movably connected to the anvil and the third drive shaft. Under the action of external force and the elastic force of the elastic member, the fitting moves relative to the third drive shaft and drives the anvil to reciprocate along the axial direction of the third drive shaft, so that the anvil applies a circumferential impact torque to the output shaft.

[0026] In conjunction with the first aspect of this application, in an alternative embodiment, the fitting is a steel ball;

[0027] The outer wall of the third drive shaft is provided with a moving groove;

[0028] The anvil has a receiving groove on its inner wall. The steel ball is located in the receiving groove and the moving groove. The steel ball exerts a force on the side wall of the receiving groove under the pressure of the inner wall of the moving groove, thereby driving the anvil to move synchronously.

[0029] In conjunction with the first aspect of this application, in an optional embodiment, the output shaft has an anvil seat at one end near the anvil hammer, the anvil seat having a pair of receiving protrusions circumferentially distributed around the axis of the output shaft, the pair of receiving protrusions engaging with the anvil hammer in the rotational direction.

[0030] In conjunction with the first aspect of this application, in an optional embodiment, the anvil hammer has a striking portion at one end near the output shaft, the striking portion having a pair of striking protrusions circumferentially distributed around the axis of the anvil hammer, the pair of striking protrusions engaging with the pair of receiving protrusions in the rotational direction.

[0031] Secondly, embodiments of this application provide a power tool, including an adapter assembly for a power tool as described in any embodiment of the first aspect.

[0032] The adapter assembly for power tools provided in this application embodiment is used to connect the output shaft of the work head to be unstuck to rotate under the transmission action of the reverse transmission assembly, and the rotation direction of the output shaft is opposite to the rotation direction of the first transmission shaft. The adapter assembly can drive the work head to be unstuck to rotate in the opposite direction, thereby unstuck the work head stuck in the wall. This not only improves the unstuck efficiency of the work head, but also greatly reduces the damage to the wall.

[0033] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0034] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0035] Figure 1 A three-dimensional schematic diagram of the overall structure of a power tool equipped with an adapter assembly, provided in an embodiment of this application;

[0036] Figure 2 A top view of a power tool equipped with an adapter assembly, provided in an embodiment of this application;

[0037] Figure 3 for Figure 2 Schematic diagram of the cross section at point AA;

[0038] Figure 4 A schematic diagram of the structure of an adapter assembly for power tools provided in this application embodiment;

[0039] Figure 5 for Figure 4 Schematic diagram of the cross section at point BB;

[0040] Figure 6 A schematic diagram showing the relationship between the first drive shaft, the forward gear, the second drive shaft, and the reverse gear in the adapter assembly for power tools provided in this application embodiment;

[0041] Figure 7 for Figure 5 Enlarged diagram of point C in the middle.

[0042] Figure label:

[0043] a. Working head;

[0044] 1. Power tools;

[0045] 100. Adapter components;

[0046] 10. Shell;

[0047] 20. First drive shaft;

[0048] 30. Reverse transmission assembly; 310. Second transmission shaft; 320. Reverse rotation assembly; 321. Forward rotation gear; 322. Reverse rotation gear;

[0049] 40. Output shaft; 41. Anvil; 410. Receiving protrusion;

[0050] 50. Speed ​​reduction mechanism;

[0051] 60. Impact transmission assembly; 610. Third drive shaft; 611. Moving groove; 620. Impact assembly; 621. Anvil; 6211. Receiving groove; 6212. Hammering part; 6213. Hammering protrusion; 622. Elastic element; 623. Fitting part; 6231. Steel ball. Detailed Implementation

[0052] To make the technical solution and beneficial effects of this utility model more apparent and understandable, a detailed description is provided below by listing specific embodiments. The accompanying drawings are not necessarily drawn to scale, and local features may be enlarged or reduced to more clearly show the details of the local features; unless otherwise defined, the technical and scientific terms used herein have the same meanings as those in the technical field to which this application pertains.

[0053] In the description of this utility model, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of simplifying the description of this utility model and do not indicate that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. In other words, they should not be construed as limitations on this utility model.

[0054] In this utility model, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating the relative importance of the indicated features or the number of indicated technical features. Therefore, a feature specified as "first" or "second" can explicitly indicate that at least one of those features is included. In the description of this utility model, "multiple" means at least two, such as two, three, etc.; "several" means at least one, such as one, two, three, etc., unless otherwise explicitly specified.

[0055] In this utility model, unless otherwise explicitly defined, the terms "installation," "connection," "linking," "fixing," and "setting," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can also refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0056] In this utility model, unless otherwise explicitly defined, the terms "above," "on top of," "above," "over," "below," "below," "below," or "below" for "first feature above second feature" can refer to direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Furthermore, "above," "above," and "over" for "first feature above second feature" can mean the first feature is directly above or diagonally above the second feature, or simply indicates that the horizontal height of the first feature is higher than the horizontal height of the second feature. Similarly, "below," "below," and "below" for "first feature below second feature" can mean the first feature is directly below or diagonally below the second feature, or simply indicates that the horizontal height of the first feature is lower than the horizontal height of the second feature.

[0057] Please refer to Figures 1 to 3 , Figure 1The embodiments of the present application show a power tool 1 connected to an adapter assembly 100. The power tool 1 in this application is illustrated by an electric hammer, but other types of power tools 1, such as an impact drill, are also possible.

[0058] During operation, the working head of power tool 1 may get stuck, and manually freeing the working head a is time-consuming and laborious.

[0059] Based on this, this application provides an adapter assembly for power tools. The first drive shaft 20 of the adapter assembly 100 is detachably connected to the power tool 1, and the output shaft 40 is sleeved on the work head a to be freed. The output shaft 40 rotates in the opposite direction under the transmission action of the reverse transmission assembly 30, so as to drive the work head a to be freed to rotate in the opposite direction, thereby freeing the work head a stuck in the wall. This not only improves the freeing efficiency of the work head a, but also greatly reduces the damage to the wall.

[0060] Figure 3 It shows Figure 2 A cross-sectional view at point AA. Figure 3 The diagram shows an output shaft 40 sleeved onto a work head a to be freed, and a first drive shaft 20 installed in a second mounting hole in the power tool 1 for mounting work head a. This can be understood as follows: during normal operation of the power tool 1, the second mounting hole is used to mount work head a; however, when work head a is stuck in the wall, the second mounting hole is used to mount the first drive shaft 20. The end of the first drive shaft 20 mounted in the second mounting hole has the same structure as work head a. The motor in the power tool 1 drives the first drive shaft 20 to rotate, and under the action of the reverse transmission assembly 30, causes the output shaft 40 to rotate. The rotation direction of the output shaft 40 is opposite to the rotation direction of the first drive shaft 20, facilitating the freeing of work head a stuck in the wall.

[0061] It should be noted that the drill bits of high-powered electric picks or impact drills can only rotate in one direction and not in the opposite direction. The adapter assembly 100 allows the work head a, which is stuck in the wall, to be rotated in the opposite direction to free it.

[0062] For details, please refer to Figure 4 and Figure 5 , Figure 5 for Figure 4The diagram shows a cross-sectional view of the adapter assembly 100 at point BB. The adapter assembly 100 includes a housing 10, a first drive shaft 20, a reverse drive assembly 30, and an output shaft 40. The first drive shaft 20 is rotatably connected to the housing 10, with one end located inside the housing 10 and the other end detachably connected to a second mounting hole in the power tool 1. The reverse drive assembly 30 is housed within the housing 10 and is drively connected to the first drive shaft 20. The output shaft 40 is rotatably connected to the housing 10, with one end drively connected to the reverse drive assembly 30 and the other end connected to the work head a to be freed.

[0063] The output shaft 40 drives the work head a to be unstuck to rotate in the opposite direction under the transmission action of the reverse transmission assembly 30. The rotation direction of the output shaft 40 is opposite to that of the first transmission shaft 20, that is, the rotation direction of the work head a to be unstuck is opposite to that of the first transmission shaft 20, so as to unstuck the stuck work head a.

[0064] In one alternative embodiment, please refer to Figure 5 The reverse transmission assembly 30 includes a second transmission shaft 310 and a reverse transmission assembly 320. The reverse transmission assembly 320 is connected to the second transmission shaft 310. The second transmission shaft 310 rotates under the transmission action of the reverse transmission assembly 320, so that the rotation direction of the second transmission shaft 310 is opposite to that of the first transmission shaft 20.

[0065] It can be understood that the reversing component 320 is connected to both the first drive shaft 20 and the second drive shaft 310. The rotation direction of the second drive shaft 310 is opposite to that of the first drive shaft 20 under the action of the reversing component 320, thereby enabling the second drive shaft 310 to drive the output shaft 40 to rotate in the opposite direction, so as to free the stuck working head a.

[0066] Furthermore, the reversing assembly 320 includes a forward gear 321 and a reverse gear 322. The forward gear 321 is connected to the first drive shaft 20 and follows the first drive shaft 20 in a first direction. Figure 6 The rotation is in the direction of arrow r1 shown in the diagram. The reverse gear 322 is connected to the second transmission shaft 310, and meshes with the forward gear 321. The reverse gear 322 rotates in the second direction... Figure 6 The arrow r2 shown in the diagram rotates in the direction of rotation, with the first direction being opposite to the second direction.

[0067] In an optional embodiment, the adapter assembly 100 further includes a reduction mechanism 50, which is drive-connected to the second drive shaft 310. The rotational speed of the second drive shaft 310 is reduced by the reduction mechanism 50, and the reduced rotational speed is transmitted to the output shaft 40.

[0068] In an alternative embodiment, such as Figure 5As shown, the adapter 100 also includes an impact transmission assembly 60, which is used to convert the rotational motion output by the reduction mechanism 50 into a rotational impact motion, so as to achieve the effect of bearing the impact force while the output shaft 40 rotates in the opposite direction with the work head a to be freed, thereby improving the freeing efficiency of the work head a to be freed.

[0069] Specifically, the impact transmission assembly 60 includes a third transmission shaft 610 and an impact assembly 620. The third transmission shaft 610 is connected to the reduction mechanism 50, and the impact assembly 620 is connected to the third transmission shaft 610. Under the transmission action of the first transmission shaft 20, the impact assembly 620 is used to apply circumferential impact torque to the output shaft 40.

[0070] Furthermore, such as Figure 5 and Figure 7 As shown, the impact assembly 620 includes an anvil 621, an elastic element 622, and a fitting element 623. The anvil 621 is fitted onto one end of the third drive shaft 610 near the output shaft 40 and engages with the output shaft 40. The elastic element 622 is fitted onto the third drive shaft 610, with one end connected to the anvil 621 and the other end connected to the third drive shaft 610. When the anvil 621 moves along the axial direction of the third drive shaft 610, the elastic element 622 deforms.

[0071] The fitting 623 is movably connected to the anvil 621 and the third drive shaft 610. Under the action of external force and the elastic force of the elastic member 622, the fitting 623 moves relative to the third drive shaft 610 and drives the anvil 621 to reciprocate along the axial direction of the third drive shaft 610, so that the anvil 621 applies a circumferential impact torque to the output shaft 40.

[0072] Furthermore, the fitting 623 is a steel ball 6231. The outer wall of the third drive shaft 610 is provided with a moving groove 611, and the anvil 621 is provided with a receiving groove 6211. The steel ball 6231 is located in the receiving groove 6211 and the moving groove 611. The steel ball 6231 moves in the moving groove 611 and drives the anvil 621 to move synchronously.

[0073] Furthermore, the output shaft 40 has an anvil seat 41 at one end near the anvil 621. The anvil seat 41 is provided with a pair of receiving protrusions 410. The pair of receiving protrusions 410 are circumferentially distributed around the axis of the output shaft 40, and the pair of receiving protrusions 410 engage with the anvil 621 in the rotational direction.

[0074] The anvil hammer 621 has a hammering part 6212 at one end near the output shaft 40. The hammering part 6212 is provided with a pair of hammering protrusions 6213. The pair of hammering protrusions 6213 are circumferentially distributed around the axis of the anvil hammer 621. The pair of hammering protrusions 6213 engage with a pair of receiving protrusions 410 in the rotational direction.

[0075] The adapter assembly 100 used in the power tool 1 has its working head a locked inside the wall. The first drive shaft 20 of the adapter assembly 100 is installed in the second mounting hole of the power tool 1. The first drive shaft 20 rotates under the driving force of the motor in the power tool 1, and the second drive shaft 310 and the third drive shaft 610 rotate in opposite directions under the action of the reverse drive assembly 30. Due to the large resistance, the steel ball 6231 moves away from the output shaft 40 in the moving groove 611 and drives the anvil 621 to move together, causing the elastic element 622 to compress and deform.

[0076] When the hammering protrusion 6213 of the hammering part 6212 disengages from the receiving protrusion 410, the anvil hammer 621, due to the elastic element 622 overcoming the elastic force, once again causes the hammering protrusion 6213 to engage with the receiving protrusion 410 and generate a rotational impact force. Through the periodic and repeated rotational impact force, the jammed working head a is rotated out of its predicament.

[0077] The output shaft 40 of this embodiment has a first mounting hole for mounting the work head a to be freed from its entrapment. The cross-section of the first mounting hole is circular or square. Of course, it is not limited to these; the cross-section of the first mounting hole can also be other structures.

[0078] The end structure of the first drive shaft 20 used for mounting in the second mounting hole of the power tool 1 can also be selected according to requirements, and the embodiments of this application do not impose specific limitations.

[0079] This application embodiment also provides a power tool 1, which includes the adapter component 100 for the power tool 1 provided in any of the above embodiments. When the working head a gets stuck in the wall, the power tool 1 with the adapter component 100 can efficiently free the working head a stuck in the wall and can greatly reduce the damage to the wall.

[0080] It should be understood that the above embodiments are exemplary and are not intended to encompass all possible implementations included in the claims. Various modifications and changes can be made to the above embodiments without departing from the scope of this disclosure. Similarly, the various technical features of the above embodiments can be arbitrarily combined to form other embodiments of this application that may not be explicitly described. Therefore, the above embodiments only illustrate several implementations of this application and do not limit the scope of protection of this patent application.

Claims

1. An adapter assembly for power tools, characterized in that, The adapter assembly (100) includes: Shell (10); A first drive shaft (20) is rotatably supported on the housing (10). One end of the first drive shaft (20) extends into the housing (10), and the other end is connected to the power tool (1). The first drive shaft (20) rotates around its own axis under the driving force of the power tool (1). The output shaft (40) is rotatably supported on the housing (10). One end of the output shaft (40) is connected to the first drive shaft (20), and the other end is provided with an axial hole for receiving the work head (a) to be freed. An impact transmission assembly (60) is housed within the housing (10) and is drively connected between the first transmission shaft (20) and the output shaft (40); The impact transmission assembly (60) is driven by the power tool (1) and stores energy in the circumferential direction before impacting the output shaft (40) so that the work head (a) to be freed is subjected to circumferential impact torque and is freed.

2. The adapter assembly for power tools according to claim 1, characterized in that, The impact transmission assembly (60) applies a circumferential impact to the work head (a) to be freed in the opposite direction to the direction in which the work head (a) is stuck. The impact transmission assembly (60) includes a reverse transmission assembly (30), which includes: Second drive shaft (310); The reversing assembly (320) is connected to the second drive shaft (310), which rotates under the transmission action of the reversing assembly (320) so that the rotation direction of the second drive shaft (310) is opposite to that of the first drive shaft (20).

3. The adapter assembly for power tools according to claim 2, characterized in that, The inversion component (320) includes: A forward gear (321) is connected to the first drive shaft (20), and the forward gear (321) rotates along the first direction following the first drive shaft (20); A reverse gear (322) is connected to the second drive shaft (310). The reverse gear (322) meshes with the forward gear (321) and rotates in a second direction, which is opposite to the second direction.

4. The adapter assembly for power tools according to claim 2, characterized in that, The adapter assembly (100) also includes: The speed reduction mechanism (50) is connected to the second drive shaft (310).

5. The adapter assembly for power tools according to claim 1, characterized in that, The impact transmission assembly (60) includes: The third drive shaft (610) is connected to the first drive shaft (20) in a transmission manner; The impact assembly (620) is connected to the third drive shaft (610). Under the transmission action of the third drive shaft (610), the impact assembly (620) applies a circumferential impact torque to the output shaft (40).

6. The adapter assembly for power tools according to claim 5, characterized in that, The output shaft (40) has an anvil (41) at one end near the anvil (621). The impact assembly (620) includes: An anvil (621) is fitted around the outer periphery of the third drive shaft (610). The anvil (621) can rotate around the axis of the third drive shaft (610) and can move along its axial direction. The anvil (621) has a hammering part (6212) at one end near the output shaft (40). The hammering part (6212) engages with the anvil seat (41). The output shaft (40) and the anvil (621) achieve power transmission through the cooperation of the hammering part (6212) and the anvil seat (41). An elastic element (622) is fitted onto the third drive shaft (610). One end of the elastic element (622) is connected to the anvil (621), and the other end is connected to the third drive shaft (610). A fitting (623) is disposed between the anvil (621) and the third drive shaft (610). The fitting (623) is driven by the third drive shaft (610) and drives the anvil (621) to reciprocate along the axial direction of the third drive shaft (610) and rotate circumferentially, so that the anvil (621) applies a circumferential impact torque to the output shaft (40).

7. The adapter assembly for power tools according to claim 6, characterized in that, The fitting (623) is a steel ball; The outer wall of the third drive shaft (610) is provided with a moving groove (611). The anvil (621) has a receiving groove (6211) on its inner wall. The steel ball is located in the receiving groove (6211) and the moving groove (611). The steel ball exerts a force on the side wall of the receiving groove (6211) under the pressure of the inner wall of the moving groove (611) to drive the anvil (621) to move synchronously.

8. The adapter assembly for power tools according to claim 6, characterized in that, The anvil (41) is provided with a pair of receiving protrusions (410), which are circumferentially distributed around the axis of the output shaft (40), and the pair of receiving protrusions (410) engage with the anvil (621) in the rotational direction.

9. The adapter assembly for power tools according to claim 8, characterized in that, The hammering part (6212) is provided with a pair of hammering protrusions (6213), which are circumferentially distributed around the axis of the anvil (621), and the pair of hammering protrusions (6213) engage with the pair of receiving protrusions (410) in the rotational direction.

10. A power tool, characterized in that, The adapter assembly for power tools as described in any one of claims 1 to 9.

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